Highly Stable Photocatalytic Dry and Bi-Reforming of Methane with the Role of a Hole Scavenger for Syngas Production over a Defective Co-Doped g-C3N4 Nanotexture

Photocatalytic reduction of CO2 with CH4 through the dry reforming methane (DRM) is an attractive approach to recycling greenhouse gases into valuable chemicals and fuels; however, this process quite challenging. Although there growing interest in designing efficient photocatalysts, they are less stable, have lower photoactivity when employed for DRM reactions. Herein, we developed a noble metal-free hierarchical graphitic carbon nitride (HC3N4) loaded cobalt (Co) highly stable photocatalytic produce synthesis (CO H2). The performance newly designed Co/HC3N4 composite was tested different systems such as methane, bi-reforming (BRM) methanol–water. HC3N4 much higher compared bulk g-C3N4, whereas found be promising charge carrier separation visible light absorption. yield CO H2 1.85- 1.81-fold than using g-C3N4 due separation. optimized 2% produces at evolution rate 555 41.2 µmol g−1 h−1, which 18.28- 1.74-fold more during (DRM), CH4/CO2 feed ratio 1.0. This significantly enhanced presence Co. further investigated, 2:1 best production. In contrast, highest produced 1:1 competitive adsorption reactants over catalyst surface. investigated methanol. Using CH4/H2O, production reduced, evolved BRM involving methanol H2O, 10.77- 1.39-fold efficiency achieved methane. also very continuous gas consecutive cycles. Thus, co-assisted nanotexture promoting activity can explored other solar energy applications.